Method for cooling centrifugally cast hollow metal blooms



W. KOEHN Nov. 29, 1932.

METHOD FOR COOLING CENTRIFUGALLY CAST HOLLOW METAL BLOOMS Filed Aug. 26, 1951 Patented Nov. 29, 1932 UNITED STATES PATENT 'OFFICE METHOD FOR COOLING CENTRIFUGALLY CAST HOLLOW METAL BLOOMS Application led August 26, 1931, Serial No.

This invention relates to a method for coolin centrifugall cast hollow metal blooms. n the centri uging of hollow blooms of metal in verticall disposed rotating chillmoulds, the working operations are of too long a duration due to the slow progress of the cooling of the inner hollow portion of the bloom. Liquid and gaseous cooling media, which have heretofore been applied in the hollow space of the bloom are not without inuence on the metal which is particularly sensitive in this respect when in the liquid state, the said cooling media. producing changes in the structure or even in the composition of the metal.

This invention comprises a method of cooling a centriiugally cast hollow metal bloom which comprises introducing a cooling body into the space within the bloom in such a manner as to maintain the cooling body out of contact with the said bloom.

In order that the invention may be fully understood, reference is directed to the accompanying drawing in which Flgure 1 is a vertical sectional view of an a paratus for carrying the invention into eect, and

Figure 2 is a plan of Figure l.

Referring to the drawing` a rigid frame ora column A is secured to a casting machine and a swinging arm B is mounted thereon. The arm B carries a hollow cylinder C at its free end which is arranged to receive water or other cooling medium in any convenient manner, such for example as by means of the pipe connections illustrated in the drawing. The cylinder C is arranged so as to be movable either manually or by means of a gear.

When the apparatus is in use the arm is 40 moved so as to be located over the hollow bloom in the rotating chill-mould and by means of a ratchet pawl, a pin, clamp, or the like, the arm is secured so that the cylinder C is located in a central position, previously determined relatively to the hollow bloom. The cylinder C is then lowered into the hollow space of the bloom to a depth limited by a previously arranged stop. On the downward movement of the cylinder C or before, the liquid or gaseous cooling medium is set 559,578, and in Germany January 13, 1931.

in circulation in the cylinder C and is so regulated that the heat absorbed by the cooling mediumis carried away. v

Itis to be observed that it is not absolutely necessary that the cooling body should be cooled by a liquid or gaseous cooling medium, as in certain circumstances a heavy metal body may be employed as the cooling body which absorbs the superliuous heat of the centrifugally east bloom. The cooling body secured to the swinging arm is, as above mentioned, so adjusted that in its upward or downward movement it always extends centrally or as centrally as possible into the rotating hollow bloom to be cooled and thus the cooling body cannot'come into contact with the cover of the rapidly rotating chillmould or the hollow bloom therein. The outer diameter of the cooling body must, of course, be smaller than the inlet opening of u the chill-mould cover, in order to make a contact between the two impossibles, and also to permit the flow of gases escaping from the centrifugally cast bloom to the exterior of the mould. s

When the invention is applied to the cooling of centrifugally cast hollow blooms of relatively large diameter, two or more` cooling devices are preferably employed in accordance with the internal diameter of the 8 hollow bloom.

In this instance, also, the cooling bodies are so fixed and adjusted on the swinging arm B that in the lowering and raising operations thereof, as also during the cooling process, S5 no contact takes places between the cooling bodies and the rotating cast bloom.

It is possible by the aid of the improved method of cooling to reduce the time of cooling of centrifugally cast bloom which, in the case of relatively heavy blooms, has heretofore taken up to one hour, to halt` the usual time, so that the invention enables the number of the casting machines to be corrospondingly reduced and the costs in respect of s power and wages is also correspondingly reduced.

I claim:

1. A method of cooling a ccntrifugally cast hollow metal bloom which comprises introducngI u cooling body into the space Within the bloom and maintaining the cooling body out of Contact with the said bloom.

2. A method of cooling a centrifugally cast hollow metall body which comprises introducing u cooling body into the space Within the bloom and conducting the heat absorbed by the cooling body away therefrom by a fluid' medium while maintaining said body out of Contact with said bloom` In testimony whereof I have signed my name to this specification.

WILHELM KOEHN. 

